Swelling is the enlargement of organs, skin, or other body parts. It is caused by a buildup of fluid in the tissues. The extra fluid can lead to a rapid increase in weight over a short period of time (days to weeks). Swelling can occur all over the body (generalized) or only in one part of the body (localized).
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4

Could be:
Lymph nodes are all over the body. You cannot feel most of them but the head and neck area have many which can be felt and that shallow pocket above your collarbone is one area where they are appreciated. There are, however, other causes for swelling and depending upon your symptoms, if this doesn't go away see your doctor.
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5

See your physician:
First, you need to find the cause. A number of problems can produce the symptoms that you have. You need to see your physician. A thorough history and physician exam, probably with Xrays or the area may provide the answer. Sometimes, further tests are required. Once you can identify the specific cause, it can be properly treated.
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6

Difficult answer:
See your pcp for starters. This is a vague finding. It may represent a myriad of causes ranging from neurogenic causes, circulation problems, injury, inflammation/rheumatologic etc.
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8

Did you :
Injure it? Are you left handed? Do you carry your purse on that shoulder? It sounds like some kind of spasm that is causing the swelling and pain. Have you tried ice or heat or Ibuprofen or aleve (naproxen)?
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Get it checked!:
Swollen lymph nodes can be secondary to a viral or bacterial infection or other sources of inflammation, 0. Of greatest concern (admittedly unlikely) is cancer or lymphoma. While it is not likely, it is scary and should be checked.
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15

Rib cage swelling:
There may be many different reasons why you have swelling around your rib cage. Possible causes include, but are not limited to: rib contusion, rib fracture, costochondritis, shingles, and intercostal neuritis. I would seek a formal evaluation from a qualified medical professional - especially if your swelling is associated with chest pain and/or associated skin lesions.
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17

Muscle:
Muscle strain. These vague symptoms could relate to muscular strain from repetitive movements or an injury, Rest, ice, heat alternating every 15 minutes may help. If no please see your physician.
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18

Doubt they are relat:
I am very doubtful that the swelling that you were describing has anything to do with the light-headedness. The swelling is a benign phenomena, just some slight edema.
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19

Get checked:
You would certainly want to be checked immediately. There are multiple potential causes, from potential complications from the epidural to conditions that may be unrelated to the neck or epidural but could still be dangerous such as an axillary vein thrombosis. Thank you for your question.
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20

See physician:
To be sure. However, this could be a couple things, including a chronic bursitis which is causing pressure on the ulnar nerve causing the radiating pain. There are a number of other structures in the elbow that can cause chronic inflammation though and thorough history and physical is necessary with possible imaging.
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